United States Pharmacopeia

The United States Pharmacopeia (USP) is a pharmacopeia (compendium of drug information) for the United States published annually by the over 200-year old United States Pharmacopeial Convention (usually also called the USP), a nonprofit organization that owns the trademark and also owns the copyright on the pharmacopeia itself. The USP is published in a combined volume with the National Formulary (a formulary) as the USP-NF. If a drug ingredient or drug product has an applicable USP quality standard (in the form of a USP-NF monograph), it must conform in order to use the designation "USP" or "NF".

Source: Wikipedia — United States Pharmacopeia (CC BY-SA 4.0)